How To Fix CN645 - The assignment exists already

CN645 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 645

• Message text: The assignment exists already

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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CN645 - Details

• The SAP error message CN645 ("The assignment exists already") typically occurs in the context of project management or cost center assignments within the SAP system. This error indicates that there is an attempt to create an assignment (such as a cost element, project, or activity) that already exists in the system.
  
  Cause:
  
  Duplicate Assignment: The most common cause is that the assignment you are trying to create already exists in the system. This could be due to a previous entry that was not properly deleted or an attempt to reassign an existing object.
  Incorrect Data Entry: Sometimes, the error can arise from incorrect data entry, where the system interprets the input as a duplicate.
  
  Configuration Issues: There may be configuration settings that prevent the creation of multiple assignments for the same object.
  
  
  Solution:
  
  Check Existing Assignments: Before creating a new assignment, check the existing assignments for the object in question. You can do this by navigating